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<a name="boost.accumulators.extractor"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle">Struct template extractor</span></h2>
<p>boost::accumulators::extractor</p>
</div>
<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../accumulators/reference.html#header.boost.accumulators.framework.extractor_hpp" title="Header &lt;boost/accumulators/framework/extractor.hpp&gt;">boost/accumulators/framework/extractor.hpp</a>&gt;

</span><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Feature<span class="special">&gt;</span> 
<span class="keyword">struct</span> <a class="link" href="extractor.html" title="Struct template extractor">extractor</a> <span class="special">{</span>
  <span class="comment">// types</span>
  <span class="keyword">typedef</span> <a class="link" href="extractor.html" title="Struct template extractor">extractor</a><span class="special">&lt;</span> <span class="identifier">Feature</span> <span class="special">&gt;</span> <a name="boost.accumulators.extractor.this_type"></a><span class="identifier">this_type</span><span class="special">;</span>

  <span class="comment">// member classes/structs/unions</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> A1<span class="special">&gt;</span> 
  <span class="keyword">struct</span> <a class="link" href="extractor/result_this_ty_idp26525424.html" title="Struct template result&lt;this_type(A1)&gt;">result</a><span class="special">&lt;</span><span class="identifier">this_type</span><span class="special">(</span><span class="identifier">A1</span><span class="special">)</span><span class="special">&gt;</span> <span class="special">{</span>
  <span class="special">}</span><span class="special">;</span>

  <span class="comment">// <a class="link" href="extractor.html#idp26526720-bb">public member functions</a></span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Arg1<span class="special">&gt;</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <a class="link" href="extractor.html#idp26526928-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">Arg1</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> AccumulatorSet<span class="special">,</span> <span class="keyword">typename</span> A1<span class="special">&gt;</span> 
    <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <a class="link" href="extractor.html#idp26528480-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">AccumulatorSet</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">A1</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> AccumulatorSet<span class="special">,</span> <span class="keyword">typename</span> A1<span class="special">,</span> <span class="keyword">typename</span> A2<span class="special">,</span> <span class="special">...</span> <span class="special">&gt;</span> 
    <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <a class="link" href="extractor.html#idp26530992-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">AccumulatorSet</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">A1</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">A2</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span> 
                           <span class="special">...</span><span class="special">)</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="idp13969856"></a><h2>Description</h2>
<p>Extracts the result associated with Feature from the specified <a class="link" href="accumulator_set.html" title="Struct template accumulator_set">accumulator_set</a>. </p>
<div class="refsect2">
<a name="idp13970768"></a><h3>
<a name="idp26526720-bb"></a><code class="computeroutput">extractor</code> public member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Arg1<span class="special">&gt;</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <a name="idp26526928-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">Arg1</span> <span class="keyword">const</span> <span class="special">&amp;</span> arg1<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>Extract the result associated with Feature from the accumulator set 
</p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> AccumulatorSet<span class="special">,</span> <span class="keyword">typename</span> A1<span class="special">&gt;</span> 
  <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <a name="idp26528480-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">AccumulatorSet</span> <span class="keyword">const</span> <span class="special">&amp;</span> acc<span class="special">,</span> <span class="identifier">A1</span> <span class="keyword">const</span> <span class="special">&amp;</span> a1<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. 
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
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<td><p><span class="term">Parameters:</span></p></td>
<td><div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><code class="computeroutput">a1</code></span></p></td>
<td><p>Optional named parameter to be passed to the accumulator's result() function. </p></td>
</tr></tbody>
</table></div></td>
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</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> AccumulatorSet<span class="special">,</span> <span class="keyword">typename</span> A1<span class="special">,</span> <span class="keyword">typename</span> A2<span class="special">,</span> <span class="special">...</span> <span class="special">&gt;</span> 
  <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <a name="idp26530992-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">AccumulatorSet</span> <span class="keyword">const</span> <span class="special">&amp;</span> acc<span class="special">,</span> <span class="identifier">A1</span> <span class="keyword">const</span> <span class="special">&amp;</span> a1<span class="special">,</span> 
                         <span class="identifier">A2</span> <span class="keyword">const</span> <span class="special">&amp;</span> a2<span class="special">,</span> <span class="special">...</span><span class="special">)</span><span class="special">;</span></pre>
<p>This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. </p>
</li>
</ol></div>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2005, 2006 Eric Niebler<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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